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MID-CRETACEOUS RUDISTS (BIVALVIA: HIPPURITIDA) FROM THE LANGSHAN FORMATION, LHASA BLOCK, TIBET
Rao, Xin (饶馨)1,2; Skelton, Peter W.3; Sha, Jingeng (沙金庚)1; Cai, Huawei (蔡华伟)1; Iba, Yasuhiro4
2015-11-01
Source PublicationPAPERS IN PALAEONTOLOGY
ISSN2056-2799
Volume1Issue:4Pages:401-424
Abstract

The Cretaceous Langshan Formation, which crops out along the northern portion of the Lhasa block, is composed mainly of grey or grey-black fine-grained limestones, argillaceous limestones and a few thin-bedded siltstones and silty mudstones. From specimens collected and/or photographed in the field, combined with a revision of taxa previously recorded from the Langshan Formation, four rudist taxa are recognized: (1) Auroradiolites gen. nov.; (2) Eoradiolites cf. davidsoni; (3) Magallanesia rutogensis sp. nov.; and (4) Sellaea sp. We propose Auroradiolites gen. nov. for the grouping of SW Asian to Pacific radiolitid species formerly attributed to Eoradiolites and characterized by a compact (non-celluloprismatic) outer shell layer. The new genus is represented in the Langshan Formation by A. biconvexus (Yang et al., 1982), including several other synonymized taxa. Taxonomic confusion in the literature has resulted from the varied appearance of the strongly developed ligamentary infolding in such forms: in the right valve, it has a forked inner termination, but common transverse sections through both valves show the latter juxtaposed against its broad, rounded counterpart in the left valve, giving the combined terminations a bulb-shaped appearance. Associated Eoradiolites cf. davidsoni is of smaller size and, by contrast, shows the celluloprismatic structure of the outer shell layer. The recently described canaliculate polyconitid genus, Magallanesia Sano et al., 2014, is represented by M. rutogensis sp. nov., which differs from the type species in possessing more numerous and ventrally extended canals in the left valve. Possibly belonging with the latter species are isolated right valves, similar to Horiopleura, but containing tabulae. A probable Sellaea sp. is represented by poorly preserved right valves nevertheless showing typical features, including a very thin outer shell layer and an erect posterior myophoral wall, separating off a broad posterior ectomyophoral cavity. Based on the presence of Magallanesia and the orbitolinid record, this rudist fauna is probably no older than late Albian, while a younger age cannot be excluded. Both Magallanesia and Auroradiolites are characteristic of a SW Asian/central Pacific faunal province, while the other two genera are more widely distributed.

KeywordRadiolitidae Auroradiolites Gen. Nov. Polyconitidae Orbitolinids Albian Sw Asian - Pacific Province
DOI10.1002/spp2.1019
Language英语
WOS KeywordPaleobiogeographic Aspects ; Mediterranean Region ; Carbonate Platforms ; Radiolitid Rudist ; Northern Ladakh ; Shyok Suture ; China ; Evolution ; Biostratigraphy ; Stratigraphy
Funding Project'Strategic Priority Research Program (B)' of the Chinese Academy of Sciences[XDB03010101] ; National Science Foundation of China[40872013] ; UNESCO-IUGS IGCP Project[632]
WOS Research AreaPaleontology
WOS SubjectPaleontology
WOS IDWOS:000364770000002
Funding Organization'Strategic Priority Research Program (B)' of the Chinese Academy of Sciences ; National Science Foundation of China ; UNESCO-IUGS IGCP Project
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/12141
Collection中国科学院南京地质古生物研究所
中国科学院南京地质古生物研究所
其他
Corresponding AuthorRao, Xin (饶馨)
Affiliation1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
3.Open Univ, Dept Earth Environm & Ecosyst, Milton Keynes MK7 6AA, Bucks, England
4.Hokkaido Univ, Dept Nat Hist Sci, Kita Ku, Sapporo, Hokkaido 0600810, Japan
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Rao, Xin ,Skelton, Peter W.,Sha, Jingeng ,et al. MID-CRETACEOUS RUDISTS (BIVALVIA: HIPPURITIDA) FROM THE LANGSHAN FORMATION, LHASA BLOCK, TIBET[J]. PAPERS IN PALAEONTOLOGY,2015,1(4):401-424.
APA Rao, Xin ,Skelton, Peter W.,Sha, Jingeng ,Cai, Huawei ,&Iba, Yasuhiro.(2015).MID-CRETACEOUS RUDISTS (BIVALVIA: HIPPURITIDA) FROM THE LANGSHAN FORMATION, LHASA BLOCK, TIBET.PAPERS IN PALAEONTOLOGY,1(4),401-424.
MLA Rao, Xin ,et al."MID-CRETACEOUS RUDISTS (BIVALVIA: HIPPURITIDA) FROM THE LANGSHAN FORMATION, LHASA BLOCK, TIBET".PAPERS IN PALAEONTOLOGY 1.4(2015):401-424.
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